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Treasure Hunting & Metal Detecting Forum Message Boards - Detector Hunter Whites Minelab Tesoro XP > Tech Talk > Metal Detectors > PI Designs & Deepseekers (Moderators: Eugene52, Cornelius) >

Goldscan Pulse IV

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NIKOS

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rabdoskopy

	Re: Goldscan Pulse IV « Reply #100 on: May 13, 2010, 11:39:22 pm »

hi alex have a nice day,thanks for exelend schematik who you give to all of us
question ,if the trimer is adjust to zero can we pot 2resistors 25k 1% to -5v +5v
question2 the graund poind or +12v is difrend on 5v stabilaizer end difrend to rest circuit
thanks agen.

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Lorenz

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	Re: Goldscan Pulse IV « Reply #101 on: May 14, 2010, 04:46:19 am »

	Quote:	Posted by alexismex
Hello Paolo,i give you some tips First at ALL disconnect the fet IRF 740 Then you must check; 1)voltages +5,-5V, 12V 2) output of the 555.... the Frequency of PPS 3) width of the pulse PPS when you have the pulse and width conform ok 4) check the output timing of the 4538'S (see my schematic you have the test point !!!) Then you can connect the fet 740 and see the signal output of first amp -all the preset adjust to zero volt see the schematic it is write on it.... you must adjust step per step and all will work fine luck Alexis.

thanks for the info alex!!!

the frequency of pin 3 is 400Hz, with potentiometer (freq.) on min, and 466Hz on max.

waveform on pin 3 of U3 (555)

waveform on pin 6/11 of U5 (I used HEF4538BP)

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http://i39.tinypic.com/2cfw5xk.jpg

http://i42.tinypic.com/2q3wy82.jpg

http://i44.tinypic.com/15pq1yh.jpg

http://i44.tinypic.com/24l1kkk.jpg


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NIKOS

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rabdoskopy

	Re: Goldscan Pulse IV « Reply #102 on: May 21, 2010, 05:01:00 am »

does eny one know if the graund poind or +12v is the same in ole circuit or not??
thancs

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alexismex

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Topo X1-V3

	Re: Goldscan Pulse IV « Reply #103 on: May 21, 2010, 06:13:42 pm »

yes it is the same

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NIKOS

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rabdoskopy

	Re: Goldscan Pulse IV « Reply #104 on: May 22, 2010, 12:03:06 am »

thank you

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Lorenz

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	Re: Goldscan Pulse IV « Reply #105 on: May 27, 2010, 09:26:04 am »

hello guys,
there are some errors in this schematic:

the N-Channel Switch(JFET), of channel 1 and 2, are connected in this mode:

I checked these connections on original goldscan board.

the resistors 10k are connected betwen the SOURCE of j113.

Theese are other errors:

bye

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http://www.geotech1.com/forums/attachment.php?attachmentid=116&stc=1&d=1123969824

http://i49.tinypic.com/xgl5xg.jpg

http://i50.tinypic.com/wjb588.jpg

http://i47.tinypic.com/10fb40j.jpg


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NIKOS

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rabdoskopy

	Re: Goldscan Pulse IV « Reply #106 on: May 28, 2010, 12:58:41 am »

one error i find more is the sens pontesiometr placing, this schematik is
ful of secret pins olso.I use the 18/01/07 modificate schematik bi alex

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Lorenz

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	Re: Goldscan Pulse IV « Reply #107 on: May 28, 2010, 01:48:17 pm »

	Quote:	Posted by NIKOS
one error i find more is the sens pontesiometr placing, this schematik is ful of secret pins olso.I use the 18/01/07 modificate schematik bi alex

Could you send me this schematic?
thank's

this is my e-mail address: lorenz.paolo@tiscali.it
is this alex's schematic?

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http://www.md4u.ru/pdf/GS-4.pdf

rv8 isn't connected in this way. I checked the connections on an original goldscan card.
also in this scheme, the jfet are connected in wrong way.

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carlinhos

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GARRET

	Re: Goldscan Pulse IV « Reply #108 on: August 17, 2010, 10:18:24 pm »

OLA AMIGO SERIA ESSA MAQUINA SENSIVEL CAPAZ DE DETECTAR 1/2G OU MENOS DEPOIS DAS MODIFICA?ES ---?

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maca_404

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	Re: Goldscan Pulse IV « Reply #109 on: September 15, 2010, 03:36:13 am »

Hi all

I have just been reading threw all the posts on the GS4 and I am very interested in building it, I have build the Hammer Head and got that working good and its a good beach machine. I live in central Victoria right in the golden triangle so I am more interested in gold and I have tried the HH here and the ground effect is really bad so I am hoping to have more luck with this machine. I found the pcb and schematic on the first page and they look good, I saw the pictures of some people who completed the board and just wanted to know, did they actually work ? I don't mind fault finding but did not want to build it if there was any major flaw.

Thanks for anyone's advice

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